Name the three groups of muscles constituting the intrinsic muscles of the hand. Briefly describe the structure and function of each of these groups
What will be an ideal response
1. Thenar: four muscles that act on the thumb and form the lateral rounded contour of the palm. 2. Hypothenar: three muscles that act on the little finger and form the medial rounded contour of the palm. 3. Intermediate: 12 muscles acting on all digits except the thumb; subgrouped as lumbricals, palmar interossei, and dorsal interossei, and located between metacarpals; needed for all phalangeal movements.
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The ________ is composed of circularly arranged layers of smooth muscle cells.
A. tunica externa B. tunica media C. tunica intima D. tunica interna E. None of the answers is correct.
Which of the following would best be described as a scanning procedure that provides visualization of fluid, soft tissue, and body structures without the use of radiation??
A) ?Computed axial tomography (CAT, or CT, scan) B) ?Magnetic resonance imaging (MRI) C) ?Positron emission tomography (PET) scan D) ?Bone scan
Cholinergic fibers use ________ as the neurotransmitter.
A. dopamine B. serotonin C. norepinephrine D. acetylcholine
Which rare condition results in individuals who possess both ovarian and testicular tissues?
A) phimosis B) cryptorchidism C) hermaphroditism D) orchiditis